Pressure-gage.



OTTO ARNOLD, JR, OF MAGDEBURG-BUCKAU, GERMANY.

PRESSURE-GAGE- Specification of Letters Patent.

Patented Jan. 8, 1907.

Application filed April 4, 1906. Serial No. 309.752.

To all whom it may concern;

Be it known'that I, Or'ro ARNOLD, Jr., a subject of the Emperor of Germany, and a resident of Magdeburg-Buckau, Germany, have invented certain new and useful Improvements in Pressure-Gages, of which the following is a specification.

My invention relates to pressure-gages, and more particularly to pressure-gages of the Bourdon type; and it has for its salient obj ect to provide a gage structure which may be cheaply manufactured, readily assembled,

and which will be accurate and of good wearing qualities under all conditions of use.

With a view to attaining these and further objects, which will best become apparent to those skilled in the art from the following description, taken in conjunction with the accompanying drawings, my invention consists in the features of construction and ar rangement of parts hereinafter more fully described, and set forth in the claims.

In the drawings, Figure 1 is a plan view of a pressure-gage with the dial and cover-plate removed. Fig. 2 is a central vertical section on line 2 2 of Fig. 1. Fig. 3 is a perspective detail of the end of the link which is connected with the pivoted gear-segment of the gage. Fig. 4 is a fragmentary detail of the blank from which said link end is made.

Throughout the drawings like numerals of reference refer always to like parts.

In the drawings, 5 indicates in general the gage-casing, having a base 5 and peripheral wall 5". 6 indicates the dial, 7 the hand or indicator member, 8 the sight-glass, and 9 the glass-retaining annulus, all of any usual or preferred construction.

In the chamber between the dial and the base are mounted the working parts.

One of the features of my invention relates to the mounting of the working elements of the gage, and has for its object to do away with expensive and unnecessary frame construction for the gage-movement. Heretofore it has been the usual practice to make the gage-movement as a unit or separate entity, the movable parts being carried in a complete frame detachable from the gage base without disassociation of the moving members, and it is one of my objects to do away with the relatively expensive removable frame. To this end I provide upon the base 5 a post or standard 10, preferably of 'considera le area in plan and having its said top or upper surface formed to present a flat bearing surface 11, extending completely across the top of the post in one direction and in the other direction extending from one edge of the post to the base of a straight shoulder 12, constituting the front face of a transverse projection 13.

14 indicates a bearing arm of suitable length, provided at one end with an enlargement 15, having a straight transverse end 16, adapted to fit in intimate contact with the shoulder 12, while the bottom surface of the enlargement is flat and rests in intimate contact with the relatively extended top surface 11 of the post. A single screw 17, taking through the enlargement 15 into the "post 11, secures said arm 14 in horizontal position against movement in any direction, as the relatively extended contact between the coacting flat surfaces of the post and enlargement 15 hold the arm rigidly against vertical la dg e 16 of the arm with the shoulder 12 prevents pivotal movement of the arm about the screw as a center.

Upon the base 5 of the casing below the arm 14 are provided lugs 18 and 19, wherein are formed bearing-recesses for the movement spindles or arbors. These recesses are preferably bushed, as shown at 18 19, with non-corrosive material, such as German silver or any other suitable metal, which will afford a good wearing non-corrosive bearing. In the arm 14 in the line of the axes of the bearings 18 19 are provided bearing-apertures 2O 21 to receive the upper ends of arbors 22 and 22, the lower ends whereof are seated in the bearings 18 and 19 in lugs 18 and 19.

The arbor 22 is located centrally of the casing and is extended through a suitable aperture in the dial to carry the hand 7 1n the usual manner. Upon said arbor is provided a small pinion 23, with which meshes a gear-segment 24, associated with the arbor 22 for rotation therewith in any usual or preferred manner.

25 indicates the usual Bourdon gage-tube, communicating at its fixed end w1th the usual nipple 26, extending to the exterior of the casing, and at its free end provided with a cap or head 27, to which is pivotally connected in the usual manner the link 28. Said link 28 is preferably formed of a fiat metal strip having at one end an L-shaped offset 28 which is bent, as shown in Fig. 3, to provide an upper finger 29, overlying the while the extended contact of the rear IOO extremity 29 of the plane portion of the link. Suitable apertures 30 are provided in said fingers 29 29, through which a pivot-pin 31, taking through the extremity of the segment moving arm of the gage-movement, passes. The tube 25 is compressed or pinched together at its free endfas shown in the drawings, and

the cap 27 is'slipped over the end and soldered thereto or sweat on, thus providing a strong and cheap construction.

The operation of the gage in general-will be well understood by those skilled in the art and need not be described.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

- 1. In a pressure-gage, the combination of a case having a flat base and a surrounding peripheral wall, a post projecting from the base into the case and integral with the'base, a bearing-arm at one end secured to the post, and a rotatable gage movement part, mounted at opposite ends in bearings in the base of the case and the bearing-arm respectively.

2. In a gage, the combination of the gagecasing, provided with an integral projecting support, having a relatively extended top surface, an arm having a relatively extended portion engaging the top surface of said projection, retaining parts taking through said arm extension and securing the arm to the projection at one end only to leave its other end free, and rotatable gage-movement members each at one end bearing in the said arm and at its ,other end bearing in an integral part of the casing.

3. In a gage, the combination of a casing providing post integral therewith extending X into the casing and having a top surface providing a flat plane portion and a shoulder transverse to said plane portion, an arm pro viding an end arranged to interfit with said shoulder, secured to said plane surface of the post and arranged with its free end projecting therefrom in parallelism to the base of the case, and rotatable gage-movement parts at one end bearing in said arm and at their opposite extremities bearing an integral part of the casing-base.

4. In a gage, a cast case provided with a projecting post 11, having relatively large superficial area in plan, and provided with a portion 13 affording a shoulder 12, an arm 14 having an enlargement 15, the edge whereof is shaped for intimate contact with the shoulder, a screw 17 securing'said arm to the post, and gage-movement spindles 22 and 22, each at one end bearing in a suitable aperture in the arm 14, and at its opposite extremity bearing in an integral portion of the casing.

5. In a gage of the character described, a casing comprising a base 5 an integral post 11 and lugs 18 and 19; an arm 14 rigidly secured to the post 11 to project therefrom in alinement with the studs 18 and 19; and gage movement arbors 22 and 22 each at one end bearing in a suitable aperture in the arm 14 and at its other extremity bearing in one of the lugs 18 and 19. I

6. In a gage of the character described, a spring-tube, a movement comprising a gagesegment, and a pivoted link connection between the tube and gage-segment, said link 7 being at an end provided with an offset L- shaped extension, bent to provide superposed alining fingers 29 29, arranged to embrace a part of the coaeting element, and perforated to receive a pivot-pin.

7. In a gage of the character described, a tube 25 compressed and sealed at its free end, and a cap bifurcated at its extended end to receive the link 28.

In testimony whereof I hereunto set my hand in the presence of two witnesses.

OTTO ARNOLD, J R.

In presence of- WILLARD H. THENTQN, O. E. GEoReIR. 

